But isn't this just comparing "six and six" to a "dozen"?
You can say exactly the same thing about the Earth orbiting the Sun as you can about the extra dimensions, or even about the theory that the reason you see a blocky shape with a glowing word-filled square in front of you is because there's a computer in front of you.
I think we're getting too close to Socrates here - i.e. the observation that we can't "know" anything, that i personally see as more of a play on the definition of the words "know" and "fact" (or at the most a comment on the usefulness of various definitions of those words) than as a truly useful philosophical realisation - maybe one of those situations where language makes philosophical problems appear from nowhere.
Um.... oh yeah: Archaeopteryx - woo! (Sorry moderators!)